Crossbar setter



IN VENT OR :S ATTQRNZY Patented Apr. 9, 1929.

i UNITED STATES MICHAEL HORBATH, OF LOWBER, PENNSYLVANIA.

CROSSBAR SETTER.

Application lediAugust 23, 1927. Serial No. 214,855.

This invention relates to a new and useful device in the nature of across bar setter particularly adapted to be used by miners, and thelike, for the purpose of supporting the roofof a mine during miningoperations.

The object of the invention is to provide a cross bar setter of novelconstruction and arrangement of parts, hereinafter more fully described,claimed, and illustrated in the accompanying drawing.

Fig. 1 is a side elevational view of my improved cross bar setter.

Fig. 2 is a top plan view thereof.

Fig. 3 is an enlarged transverse sectional view taken on the line 3 3 ofFig. l.

Fig. 4 is a further development thereof, showing in particular the meansof adjust- Y ably attaching the cross bar to the vertical supportmember.

F ig. 5 is a vertical sectional view taken on the line 5-5 of Fig. 4.

As here embodied my improved cross bar setter comprises aplate member 10or supporting member. The leg supporting members 11 are hinged as at 12,to the lug elements 13 of the plate member. rlhe leg supporting members11 are of'tubular construction adapted to slidably receive the legmembers 14 so as to permit the leg members 14 to be extended therefrom.The' threaded members 15, set screws, or the like, are threadedlymounted in the leg supporting members 11, and are adapted to engage anydesired one of the notcheslG formed in the leg members 14 as a means ofholdingl the leg members 14 in any desired extended position. The abovedescribed construction is such as will permit the leg supporting members1l to be folded when not in use, so as to provide a compact, easilycarried device. IThe .casing 17 or housing, is secured to the centerportion of the plate member 10 and is extended vertically therefrom, inopposite directions. The casing 17 is of hollow construction, andadapted to slidably accommodate the rack bar 18. The casing 17 isprovided with an open upper end, so as to permit the rack bar 18 to beextended from the said casing. The rack bar 18 is provided with gearteeth adapted to mesh with the pinion 19 secured to the shaft 20,rotatively mounted in the casing 17. The hand wheel 21 is provided witha handle 21', and is secured to the shaft 20, and is positioned outsidethe casing 17. The threaded member 22, a set screw, is threadedlymounted in the casing 17 and is adapted to engage any desired one of thenotches 23 formed in the rack bar 18 so as to hold the raclr bar 18 inany desired extended position. The rod 24 is adapted to slidably engagein the casing 17 in contact with the upper extremity of the rack bar 18and is extended through the upper open end of the casing 18. The rod 24is provided with an enlarged head 25 formed spherical, adapted topivotally receive the intermediate cross bar 26, which 1s provided witha semi-spherical aperture adapted to receive the enlarged head 25 of therod 24. rlhe intermediate cross bar 26 has hinged thereto, as at 27 and28, respectively, the cross bars 29 and 30. The pins 31 and 32 areadapted to engage in apertures formed in the cross bars 29 and 30 and inthe intermediate cross bar 26 so as to hold the said cross bars inoppositely extended positions therefrom. The above describedconstruction is such as will permit the cross bars 26 and 27 to behinged inwardly as at 32 and 33, respectively, so as to provide acompact portable device.

A pair of extension members 29 and 30 are slidably mounted in the crossbars 29 and 30, and are provided with an enlarged extremity 31. Thelatter described construction is such as will permit the said extensionmembers to be slidably extended in opposite directions.

The above described construction is such as will permit the cross bars26 and 27 to be raised as may be desired, by rotating the hand wheel 21and which will permit the said cross bars to be angular-ly positioned asmay be desired to accommodate a slanting mine ceiling, or upper wall ofa mine, or mine shaft. The extension members 29 and are slidably'extended, so as to permit my improved device to support the ceiling ofthe mine.

In Figs. 4 and 5 of the accompanying drawing, I have shown sectormembers 34 and 35 secured to the intermediate cross bar 26. The sectormembers 34 and 35 having formed therein sector apertures 36, adapted toslidably receive the extended portions of the pin 37, secured to theblock 38, slidably mounted in the axial aperture 39 formed in the upperportion of the rod 24. The expansion springs 40 and 41 are positioned inthe aperture 39 directly below and above the said block 38. The spring41 is comparatively stronger than the said spring 40 so as to hold theextended portions of the pin 37 llO in engagement with any desired oneof the p notches 42, extended-doWnWardly from the more readilymanipulated device.

Having thus described my invention what i I claim as new'and desi-re` toprotect by Letters Patent of thevUnited States is as follows: 'v

4A cross barv setter of the class described, a vertical rod, a means forraising and loweringthe same, an intermediate cross bar piv otallymount-ed on the top end of the rod, a

vmedi-ate bar, and pins removably engaging apertures in the cross Vbarsand the inter- -mediatebar for releasably holding the end cross bars inoppositely extended positions for supportingy the ceiling of a mine, andfor permitting hinging of the end crossbars to provide a compactportable device.

In testimony whereof I have afxedmy signature.

Y' MICHAEL HORBA'IH.4 i

